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m in (-oo:+oo)
7*(2*m+5) = 7 // - 7
7*(2*m+5)-7 = 0
7*(2*m+5)-7 = 0
14*m+28 = 0
14*m+28 = 0
14*m+28 = 0 // - 28
14*m = -28 // : 14
m = -28/14
m = -2
m = -2
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